Consolidated Statements of Cash Flows (Unaudited) - EEGH - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net income	$ 110	$ 673
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	927	821
Allowance for equity funds	(26)	(34)
Equity income, net of distributions	221	29
Changes in regulatory assets and liabilities	(9)	0
Deferred income taxes	(135)	47
Other, net	9	63
Changes in other operating assets and liabilities:
Trade receivables and other assets	(249)	(118)
Derivative collateral, net	14	(19)
Pension and other postretirement benefit plans	(21)	(23)
Accrued property, income and other taxes	(453)	(364)
Accounts payable and other liabilities	19	117
Net cash flows from operating activities	1,525	1,165
Cash flows from investing activities:
Capital expenditures	(1,295)	(1,356)
Other, net	(29)	43
Net cash flows from investing activities	(1,374)	(1,474)
Cash flows from financing activities:
Net cash flows from financing activities	(191)	1,358
Net change in cash and cash equivalents and restricted cash and cash equivalents	(39)	1,036
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	1,445	1,268
Cash and cash equivalents and restricted cash and cash equivalents at end of period	1,406	2,304
Eastern Energy Gas Holdings, LLC [Member]
Cash flows from operating activities:
Net income	191	202
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	80	93
Allowance for equity funds	(2)	(5)
Equity income, net of distributions	(5)	(1)
Changes in regulatory assets and liabilities	6	7
Deferred income taxes	30	15
Other, net	0	(1)
Changes in other operating assets and liabilities:
Trade receivables and other assets	(56)	357
Derivative collateral, net	2	9
Pension and other postretirement benefit plans	0	(18)
Accrued property, income and other taxes	(25)	(17)
Accounts payable and other liabilities	20	26
Net cash flows from operating activities	241	667
Cash flows from investing activities:
Capital expenditures	(55)	(76)
Loans to affiliates	0	(262)
Other, net	(1)	(4)
Net cash flows from investing activities	(56)	(342)
Cash flows from financing activities:
Net repayments of short-term debt	0	(32)
Repayment of notes payable, net	(9)	(5)
Distributions	(109)	(269)
Net cash flows from financing activities	(118)	(306)
Net change in cash and cash equivalents and restricted cash and cash equivalents	67	19
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	48	39
Cash and cash equivalents and restricted cash and cash equivalents at end of period	$ 115	$ 58